The health for which Katsuzō Nishi is grateful came by struggle.

What he was he owed to his original methods of health building, methods which were a precious outcome of years of careful study of nearly every theory of health and preventative medicine to be found in the world, of endless experimentation, and lastly, of a very critical examination, from the standpoint of modern medical science, of the knowledge so acquired.

[3] He was also an aikido teacher at Aikikai Hombu Dojo hence many aikidoka were introduced to the Nishi Health System which resulted in the incorporation of certain exercises, like the fish exercise (kingyō undō, 金魚運動), into aikido and the way aikidoka took care of their health.

[4][5] When we watch people involved in Aikido, we see that their stance is like an equilateral tetrahedron.

They change in various ways, extending and drawing, without losing their centered balance.